WEBVTT 00:10.190 --> 00:12.920 Ah, OK, good. 00:13.230 --> 00:20.000 Back now actually starting up a completely new section, so this section is going to be about what a 00:20.000 --> 00:26.210 model is, why we model and also specifically the modeling language that we're going to use when we're 00:26.210 --> 00:28.490 doing conceptual maps and conceptual models. 00:29.270 --> 00:34.610 And that language is used is called UML, the unified modeling language. 00:35.540 --> 00:38.660 So this first lecture is going to be what a model is about. 00:39.980 --> 00:48.440 So let's start what is a mother really so emotional so we can do models of all kinds of things so we 00:48.440 --> 00:48.770 can hear? 00:48.840 --> 00:51.920 Here's an example, for example, of a model or an aircraft, of course. 00:52.670 --> 00:55.930 But really, why do we model at all? 00:55.940 --> 01:01.400 And there are a couple there's a couple of different reasons for why we are actually creating models. 01:01.580 --> 01:06.970 So let's look into four of them and probably the most common ones. 01:07.520 --> 01:14.480 So when we're talking about models, it's very important to differentiate between the subject matter 01:14.810 --> 01:17.000 that is being modeled and the model. 01:17.510 --> 01:17.870 Right. 01:18.410 --> 01:25.190 So we do model because we want like to make complex subject matters more comprehensible and possible 01:25.190 --> 01:26.570 to grasp on a higher level. 01:27.650 --> 01:29.270 So this is an example of a subject. 01:29.270 --> 01:33.080 We have this thunderstorm, a thunderstorm, a hurricane. 01:34.460 --> 01:37.550 So that's the subject that's out here in the real world. 01:37.850 --> 01:40.060 And then we have a model of it. 01:40.310 --> 01:47.450 So we create the model because we need to be able to reason about this and comprehend it and understand 01:47.450 --> 01:49.570 it on a higher level, on a higher level. 01:50.090 --> 01:56.210 So we need to remove some details and we create a model and then we can use that model to similar situations. 01:56.990 --> 01:57.320 Right. 01:57.530 --> 02:00.840 Because the other reason we use a model is just that. 02:01.040 --> 02:05.960 So the first reason was just to be able to even understand very complex subject matters. 02:06.350 --> 02:09.800 And here we have another subject, which is kind of a business situation maybe. 02:09.800 --> 02:15.770 And we need to be able to simulate real world scenarios to get an approximation of how the subject may 02:15.770 --> 02:16.800 react and work. 02:17.120 --> 02:22.280 So once we have created a model, then because we cannot actually stimulate the real world subject, 02:22.460 --> 02:28.700 we can actually stimulate the model and see what happens so we can use it to try to predict the future, 02:28.700 --> 02:29.470 so to speak. 02:29.900 --> 02:33.020 So we create models to understand complex things. 02:33.200 --> 02:38.100 And then once we have a model, we can use to model and try to simulate scenarios in it. 02:40.970 --> 02:42.890 So here's kind of the model. 02:43.280 --> 02:46.490 And he was to come up with real world stagnation of sales. 02:46.520 --> 02:46.810 Right? 02:49.910 --> 02:56.600 A third thing we do with models is to try to specify, not just build tangible subjects so we could 02:56.600 --> 02:58.550 have subjects that we would like to build. 02:58.730 --> 03:04.400 So this is an example of a subject and we need to specify that in some way. 03:04.700 --> 03:06.260 And then we use a model. 03:06.350 --> 03:06.820 Right. 03:07.130 --> 03:10.190 So we use a model to specify the subject. 03:12.830 --> 03:18.770 And lastly, we also need to specify, not yet develop intangible subject as well. 03:18.920 --> 03:24.410 So like business systems or businesses or products, which is intangible. 03:25.970 --> 03:30.620 So then we have like a subject and we could have a model of an organization, for example. 03:31.060 --> 03:37.160 So those were kind of for very different reasons for using a model and situations when we use a model. 03:37.370 --> 03:42.570 The first one was to be able to understand and grasp very complex subject matters. 03:43.130 --> 03:49.670 The second one was to use the model to try to simulated, to do simulations in and to try to predict 03:49.670 --> 03:50.350 the future. 03:50.810 --> 03:57.740 And the third in the four was actually to specify not just, Bill, both physical things and also intangible 03:57.740 --> 04:00.920 things like businesses, products, I.T. systems and so on. 04:03.030 --> 04:03.570 Very good. 04:03.860 --> 04:10.650 That will see first lecture about why we actually model what are the reasons that we do actually create 04:10.650 --> 04:11.430 models for. 04:12.060 --> 04:14.370 Very good to see you in the next lecture.